So for all of you FI gurus I have a few questions for you:
I currently have a fully built short block with an open dump and JIC single exit exhaust. the Turbonetics turbo. I got my car tuned when the temperature was about 80 degrees. Car an beautiful I passed my state emmissions inspection with no problem on the Greddy E-Manage Ultimate. So being that I live in Boston, the temps have recently plumetted down to 28 degrees ! So I was driving home from work and got the notorious P0300 code followed by the flashing CEL then P0304. You could feel the car misfiring so I stayed under 2500rpms all the way home and parked it. So I decided to replace a few things to see if that would solve my problem. 1. I changed my spark plugs with the same 2 step colder NGK LFR6A-11 gapping them at 33, 2. replaced my coil packs, and 3.cleaned my MAF sensor. I drove the car around the block and it sounds like a WRX still. My question is do you think that because of the sudden temperature change is why my car is misfiring? I have no leaks in the vaccum lines and all the couplers are tight I scanned the code again and it still comes up P0304 and the scanner says 02 sensor, catalyst. I'm just wondering has this happened to any of you. I will be going to get retuned to see if this will fix the problem. Thanks!

 

It's the tune

you probably don't have temp compensation corrections set up correctly

 

Thanks for the input Gio. I kind of figured that was the reason. The engine sounds fine, no knocking noise or valve lash and no smoke but I knew it was common with the s2ks and WRXs to have this problem in cold temps. BTW how's your beast running?

 

Had to start over with a new bodyshop end of october
Right now the car is in the spray booth
Check out my thread when you get a chance

We will see each other in the summer
I'm thinking of heading your way

 

Okay then I will be looking foward to seeing it in person. Either way we will bump into each other. I was hoping to see you earlier this past Sept at the Import Evolution show but I met a few other of the G-Squad crew.

So other than the temp compensation correction I should be fine. I don't plan on driving the car until I get a re-tune. Funnily thats what I thought because I had been running fine all Summer long 80+ degrees and then every so often when it was like 50 I would throw a cell but as soon as it was like 30 out blink blink blink blink...lol. Time to pull out the old beater...lol

 

yeah you definitely need a tune for both summer and winter

 

plus 2 step is way to cold of a plug, even for summer.

 

With temp comp set right no you shouldn't. Factory cars, even turbo and super cars don't need a reflash with seasonal changes, neither should your modded car. I know most of the evo guys (my research related to turbos, etc. always seems to lead me to the evo forums) go in the winter for their year round tunes, if not they get the same issues, they say easy to comp for hotter temp, but harder for the cold. Same principle should apply here. Only know this 'cause I was just looking at seasonal times as to when is best to tune. GL

 

Unfortunately I was'nt tuned for temp comp. My setup is a little bit more unique though due to something called secondary injection in which case I believe my tuner used both fuel maps. A lot of the Suby/EVO/S2K guys up this way experience the same problem.

 

dont forget to come down to MD wat also..

 

Where did you get tuned if you don't mid my asking? Just since we're both in MA wanna see where you had it done. Not many choices up this way though, only downside :/

 

I went to see Giles over at HollyRoller Dyno in Bow NH. Tuning is becomming super scarce up North and the more worse this economy keeps getting isn't a good sign for us car enthusiast

 

2 main reasons why i say yes is because i did come from the evo realm to where we needed both winter and summer tune. also being from phx az our summer temps get 120+ and our winters to mid 30s. i dont think the temp comp can adjust that much. im not a tuner myself so im not to sure how well the temp comp can be adjusted.

op hope you get the bugs taken care of

 

I'm not sure how far you are from Norwood, but I'm gunna be going to a place called Dent Sport Garage. I've had them do a few things in the past and they really seem to know their stuff. Try giving them a call

 

Definately not! I had a friend that sold his twin turbo tuned emanage to a friend with NA mods here on the boards. Long story short is they charged him 550.00 to supposedly tune his car only for him to find out when his motor started pinging that all's they did was adjust his timing 5 degrees and had him still running on a Greddy TT map.
(https://g35driver.com/forums/northea...w-england.html see post #6 #7 and #8)
Now for my Honda Matt was the man but I would not let them tamper with my VQ if my life depended on it.